High Strain Rate Superplasticity in a Micro-grained Al-Mg-Sc Alloy with Predominant High Angle Grain Boundaries

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	High Strain Rate Superplasticity in a Micro-grained Al-Mg-Sc Alloy with Predominant High Angle Grain Boundaries
	F. C. Liu; Z. Y. Ma; F. C. Zhang
	2012
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	28 期号:11 页码:1025-1030
摘要	Friction stir processing (FSP) was applied to extruded Al-Mg-Sc alloy to produce fine-grained microstructure with a grain size of 2.2 mu m. Electron backscatter diffraction (EBSD) result showed that the grain boundary misorientation distribution was very close to a random grain assembly for randomly oriented cubes. Superplastic investigations in the temperature range of 425-500 degrees C and strain rate range of 1x10(-2)-1x1(0) s(-1) showed that a maximum elongation of 1500% was achieved at 475 degrees C and a high strain rate of 1x10(-1) s(-1). The FSP Al-Mg-Sc exhibited enhanced superplastic deformation kinetics compared to that predicted by the constitutive relationship for superplasticity in fine-grained aluminum alloys. The origin for enhanced superplastic deformation kinetics in the FSP alloy can be attributed to its high fraction of high angle grain boundaries (HAGBs). The analyses of the superplastic data and scanning electron microscopy (SEM) examinations on the surfaces of deformed specimens indicated that grain boundary sliding is the main superplastic deformation mechanism for the FSP Al-Mg-Sc alloy.
部门归属	[liu, f. c.; ma, z. y.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [liu, f. c.; zhang, f. c.] yanshan univ, state key lab metastable mat sci & technol, qinhuangdao 066004, peoples r china.;ma, zy (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;zyma@imr.ac.cn
关键词	Superplasticity Friction Stir Processing Aluminum Microstructure Friction Stir Welding Low-temperature Superplasticity Severe Plastic-deformation Zr Alloy 7075al Alloy Friction Evolution Behavior Mechanisms
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60105
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	F. C. Liu,Z. Y. Ma,F. C. Zhang. High Strain Rate Superplasticity in a Micro-grained Al-Mg-Sc Alloy with Predominant High Angle Grain Boundaries[J]. Journal of Materials Science & Technology,2012,28(11):1025-1030.
APA	F. C. Liu,Z. Y. Ma,&F. C. Zhang.(2012).High Strain Rate Superplasticity in a Micro-grained Al-Mg-Sc Alloy with Predominant High Angle Grain Boundaries.Journal of Materials Science & Technology,28(11),1025-1030.
MLA	F. C. Liu,et al."High Strain Rate Superplasticity in a Micro-grained Al-Mg-Sc Alloy with Predominant High Angle Grain Boundaries".Journal of Materials Science & Technology 28.11(2012):1025-1030.